Because of their asynchronous nature, SIP servlets can seem complicated.

由于其异步本性，SIP Servlet可能看起来有些复杂。

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You must be aware of or account for the asynchronous nature of replication if this is your chosen method.

如果选择这种方法，则必须清楚或考虑复制本身的异步性。

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Note however that due to Ajax's asynchronous nature, showing reliable progress in Ajax applications is very hard.

但是要注意，由于Ajax的异步特性，在Ajax应用程序中显示可靠的进度非常困难。

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